Which of these is NOT a consequence of dust in the interstellar medium?
A) reddening of stars' light that passes through the dust
B) blue reflection nebulae around the Pleiades
C) red light from the emission nebulae
D) the dark nebulae that block 90% of the Milky Way from us visually
E) terrestrial planets like our own
C
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The radial velocity method is less likely to detect low mass planets than high mass planets because low mass planets cause smaller ________ fluctuations
Fill in the blank(s) with correct word
Which of the following isotopes is radioactive?
A) Carbon-12 B) Carbon-14 C) both of these D) neither of these
We find most stars still on the main sequence because this stage takes ________
Fill in the blank(s) with correct word
Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500c relative to the second stage. Relative
to Earth, the speed of the third stage will have a magnitude of a. 0.500c. b. 0.800c. c. 0.929c. d. 0.972c. e. 1.500c.